Question

помогите люди добрие

Answer 1

$left { {{5(3x+y)-8(x-6y)=20} atop {6(x-10y)-13(x-y)=60}} right.Rightarrow left { {{15x+5y-8x+48y=20} atop {6x-60y-13x+13y=60}} right.$

$left { {{7x+53y=20} atop {-7x-47y=60}} right.$

Сложим уравнения
6у=80,
 у=80/6=40/3
7х=20-53·(40/3)
7х=20-(2120/3)
7х=(-2060/3)

х=-2060/21

Ответ. х=-2060/21    у= 40/3